Hwpw

**l_gaminde** · - 20th June 2025, 18:26

Im running a few chips 16f876a at 20 mhz, 18f26k22 10mhz with 4x speed so 40mhz

Even using timer 1 and timer 2 with two different ports, portc1 and portc2 you can not get two different PW is this correct

I have also noticed at times one pulse is half the duty cycle other times it can be changed this could be because i used the same timer for both

Code:

define OSC 40

	OSCCON2.7 = 1				' SYSTEM CLOCK  1=4XPLL  0= OSCILLATOR OTHER THAN 4XPLL
 	TRISA =	%11111010
	TRISB =	%11111100
	ADCON1 = %0110
	ADCON0 = %000

	T0CON =	 %00000000
	INTCON = %00000000
	INTCON2 = %00000000
	
		LED	VAR  PORTA.5  		' Assign name "LED" to PORTA.5
		HIGH LED
		PAUSE 2000
		LOW led
		PWM PORTA.5, 64, 6000
		
	DEFINE CCP1_REG PORTC	        ' USED FOR HWPW	
	DEFINE CCP1_BIT 2			' USED FOR HWPW PORTC PIN 2
	DEFINE HPWM2_TIMER1 		' DEFINE TIMER USE FOR PWM

	DEFINE CCP2_REG PORTC	        ' USED FOR HWPW  	
	DEFINE CCP2_BIT 1			' USED FOR HWPW PORTC PIN 1
	DEFINE HPWM1_TIMER2		' DEFINE TIMER USE FOR PWM

HPWM  1, 128, 5000				' OUTPUT PORTC.2				
'HPWM  2, 64, 5000				' OUTPUT PORTC.1

' HPWM  1, 128, 39000				' HIGHEST HPWM @ 50% DUTY  78.06 khz
' HPWM  1, 128, 30000				' HPWM @ 50% DUTY  60.19 khz
' HPWM  1, 128, 20000				' HPWM @ 50% DUTY  39.96 khz
' HPWM  1, 128, 10000				' HPWM @ 50% DUTY  19.98 khz
' HPWM  1, 128, 5000				' HPWM @ 50% DUTY    9.99 khz
' HPWM  1, 128, 2441				' LOWEST HPWM @ 50% DUTY  4.88 khz

**richard** · - 21st June 2025, 08:07

a pic18f26k22 can have 5 different pwm streams with 3 different frequencies all with individual duty cycles, old clunker chips like 16f876a are much less capable of course

here is 3 streams 3 frequencies
i find the hpwm command pretty inflexible and seldom use it [the clock defines are not correct in mho] , pwm is not difficult to setup manually

Code:

'****************************************************************
'*  Name    : PWM demo.pbp                                      *
'*  Author  :  Richard                                          *
'*  Notice  :                                                   *
'*          :                                                   *
'*  Date    : 21/12/2024                                        *
'*  Version : 1.0                                               *
'*  Notes   : TMR2 CCP4 10K, TMR4 CCP5 12.5K,  TMR6 CCP1 8K     *
'*          :18f26k22 @64Mhz                                    *
'****************************************************************




#CONFIG
  CONFIG  FOSC = INTIO67
  CONFIG  PLLCFG = ON
  CONFIG  PRICLKEN = ON
  CONFIG  FCMEN = OFF
  CONFIG  IESO = OFF
  CONFIG  PWRTEN = ON
  CONFIG  BOREN = SBORDIS
  CONFIG  BORV = 190
  CONFIG  WDTEN = ON
  CONFIG  WDTPS = 32768
  CONFIG  CCP2MX = PORTC1
  CONFIG  PBADEN = OFF
  CONFIG  CCP3MX = PORTB5                                
  CONFIG  T3CMX = PORTC0
  CONFIG  HFOFST = ON
  CONFIG  P2BMX = PORTB5
  CONFIG  MCLRE = EXTMCLR
  CONFIG  STVREN = ON
  CONFIG  LVP = OFF
  CONFIG  XINST = OFF
  CONFIG  DEBUG = OFF
  CONFIG  CP0 = OFF
  CONFIG  CP1 = OFF
  CONFIG  CP2 = OFF
  CONFIG  CP3 = OFF
  CONFIG  CPB = OFF
  CONFIG  CPD = OFF
  CONFIG  WRT0 = OFF
  CONFIG  WRT1 = OFF
  CONFIG  WRT2 = OFF
  CONFIG  WRT3 = OFF
  CONFIG  WRTC = OFF
  CONFIG  WRTB = OFF
  CONFIG  WRTD = OFF
  CONFIG  EBTR0 = OFF
  CONFIG  EBTR1 = OFF
  CONFIG  EBTR2 = OFF
  CONFIG  EBTR3 = OFF
  CONFIG  EBTRB = OFF
#ENDCONFIG  
    DEFINE OSC 64
    ANSELB=0
    ANSELC=0
    ANSELA=0
    trisa=% 11101111
    trisb=% 11111110
    trisc=% 11111001
    OSCCON=$70
    OSCTUNE.6=1
    
    T2CON=6         ;PRESCALE 16 TMR ON
    T4CON=6         ;PRESCALE 16 TMR ON
    T6CON=6         ;PRESCALE 16 TMR ON
    PR2=$63         ;10 KHZ
    PR4=$4F         ;12.5 KHZ
    PR6=$7C         ;8 KHZ
    CCP4CON = $0C   ;PWM MODE + DUTY LSB 2 BITS
    CCPR4L  = $32   ;DUTY MSB 8 BITS    
    CCP5CON = $0C   ;PWM MODE + DUTY LSB 2 BITS
    CCPR5L  = $27   ;DUTY MSB 8 BITS
    CCP1CON = $0C   ;PWM MODE + DUTY LSB 2 BITS
    CCPR1L  = $3E   ;DUTY MSB 8 BITS    
    CCPTMRS1  = 4   ;TMR2 CCP4, TMR4 CCP5
    CCPTMRS0  = 2   ;TMR6 CCP1 


main:
goto main

**l_gaminde** · - 23rd June 2025, 23:34

I ran your program and according to the scope they all are running the same freq. with different pulse width

**richard** · - 24th June 2025, 01:38

I ran your program and according to the scope they all are running the same freq. with different pulse width

not really they all are running the same pulse width with different freq.

**l_gaminde** · - 24th June 2025, 01:49

Well, I don't know what to say. I get all the same frequency with different pulse width.
Even the program shows different pulse width.
I even went back to the pick basic plus and i'm running for with four different timers, and they all run the same frequency, and if you set it for a different frequency, they shut down pulse width, I can control

**richard** · - 24th June 2025, 02:07

Even the program shows different pulse width.

what do you mean ,that makes little sense

Well, I don't know what to say. I get all the same frequency with different pulse width.

my code works perfectly on the simulator and the actual hardware
post your code and schematic .

**l_gaminde** · - 24th June 2025, 03:25

I ran the code that you posted.

**l_gaminde** · - 24th June 2025, 03:40

Walking and talking on the phone does not work well.
I ran your program my scope has measure function all 3 channels showed the same frequency. But the duty cycle was the only difference. I used pbp setting ccp1, ccp2, ccp3 and ccp5 port c1, c2, and port b0, b5 there is also no control of individual frequency only duty cycle

**richard** · - 24th June 2025, 04:03

If you don't get three frequencies with 50% duty cycle then you are not using my code ,chip or schema.

Post your code and schema

**l_gaminde** · - 24th June 2025, 05:38

I will rerun tomorrow and post scope pictures. Its
definitely possible. I did something wrong. I am only running at 40 MHz. At this time, I have 16 mhz crystal's coming.

**richard** · - 24th June 2025, 07:55

I have 16 mhz crystal's coming.

totally not needed for this simple test, it uses internal osc

**l_gaminde** · - 24th June 2025, 17:57

RICHARD
I reloaded your program exactly and it gave me
12.54khz with a duty of 48.75 PW on channel A1
8.02khz with a duty of 49.61 on channel C2
10.02khz with a duty of 50.01 on channel B0

You were absolutely correct and it works perfectly
do you have any documentation of the settings and what to change for different freq and duty cycles Im just getting back into this after years of being away

**l_gaminde** · - 24th June 2025, 20:11

RICHARD I need to change porta4 hwpw to another port i tried ccp3con and ccpr3l changed the ccptmrs0 but nothing works I have something else on a4 on the boards im using

**richard** · - 25th June 2025, 01:06

do you have any documentation of the settings and what to change for different freq and duty cycles

https://www.picbasic.co.uk/forum/showthread.php/4994
https://www.picbasic.co.uk/forum/showthread.php/26615
or use MCC

RICHARD I need to change porta4 hwpw to another port i tried ccp3con and ccpr3l changed the ccptmrs0 but nothing works I have something else on a4 on the boards im using

if you need porta.4 for another purpose then you cannot use CCP5

post the code you have tried

**l_gaminde** · - 25th June 2025, 19:50

first question how do you get the code box to post into

OK I was able to change the port from port a4 to port b5 now I need to figure out this

CCP4CON = $0C ; PWM MODE + DUTY LSB 2 BITS ' PORT B0
CCPR4L =%110010 ; DUTY MSB 8 BITS ' $32

it does not seem to be very straight forward I will look at the posts you sent yesterday and see if I'm able to do the math, shifting and what ever else it takes.
I did change the numbering to BIN so when looking in the manual I could line things up with the proper bits (don't get mad)

Code:

#CONFIG
  ERRORLEVEL -306	       			; turn off crossing page boundary message
  CONFIG  FOSC = INTIO67
  CONFIG  PLLCFG = ON
  CONFIG  PRICLKEN = ON
  CONFIG  FCMEN = OFF
  CONFIG  IESO = OFF
  CONFIG  PWRTEN = ON
  CONFIG  BOREN = SBORDIS
  CONFIG  BORV = 190
  CONFIG  WDTEN = ON
  CONFIG  WDTPS = 32768
  CONFIG  CCP2MX = PORTC1
  CONFIG  PBADEN = OFF
  CONFIG  CCP3MX = PORTB5                                
  CONFIG  T3CMX = PORTC0
  CONFIG  HFOFST = ON
  CONFIG  P2BMX = PORTB5
  CONFIG  MCLRE = EXTMCLR
  CONFIG  STVREN = ON
  CONFIG  LVP = OFF
  CONFIG  XINST = OFF
  CONFIG  DEBUG = OFF
  CONFIG  CP0 = OFF
  CONFIG  CP1 = OFF
  CONFIG  CP2 = OFF
  CONFIG  CP3 = OFF
  CONFIG  CPB = OFF
  CONFIG  CPD = OFF
  CONFIG  WRT0 = OFF
  CONFIG  WRT1 = OFF
  CONFIG  WRT2 = OFF
  CONFIG  WRT3 = OFF
  CONFIG  WRTC = OFF
  CONFIG  WRTB = OFF
  CONFIG  WRTD = OFF
  CONFIG  EBTR0 = OFF
  CONFIG  EBTR1 = OFF
  CONFIG  EBTR2 = OFF
  CONFIG  EBTR3 = OFF
  CONFIG  EBTRB = OFF
#ENDCONFIG 
 
    DEFINE OSC 64

    ANSELB=0
    ANSELC=0
    ANSELA=0

    trisa = %11011111
    trisb = %11011110
    trisc = %11111001


    OSCCON = %1110000		; $70
    OSCTUNE.6 = 1
    
    T2CON = %0110        		; PRESCALE 16 TMR ON PORT B0	6
    T4CON = %0110         		; PRESCALE 16 TMR ON	PORT B5	6
    T6CON = %0110         		; PRESCALE 16 TMR ON	PORT C2	6

    PR2 = %1100011        		; 10 KHZ 					PORT B0	$63
    PR4 = %1001111        		; 12.5 KHZ				        PORT B5     $4F
    PR6 = %1111100         		;   8 KHZ					PORT C2	$7C

    CCP4CON = $0C   			; PWM MODE + DUTY LSB 2 BITS	' PORT B0
    CCPR4L  =%110010  		; DUTY MSB 8 BITS				' $32
    	
    CCP3CON = $0C   			; PWM MODE + DUTY LSB 2 BITS	' PORT B5 
    CCPR3L  = %10111			; DUTY MSB 8 BITS				' $27

    CCP1CON = $0C   			; PWM MODE + DUTY LSB 2 BITS	' PORT C2
    CCPR1L  = %111110  		; DUTY MSB 8 BITS				' $3E
    
    CCPTMRS1  = %00   		: TIMER2 = CCP4, 	 ' TIMER4 CCP5 (USED WITH BELOW)
    CCPTMRS0  = %1011010	 	; TIMER6 = CCP1, 	   TIMER4 = CCP3

**richard** · - 26th June 2025, 03:27

first question how do you get the code box to post into

https://www.picbasic.co.uk/forum/showthread.php/19594

I did change the numbering to BIN so when looking in the manual I could line things up with the proper bits

it can be informative for some registers for most its just unnecessary clutter

its certainly not helped you get this correct

CCPTMRS0 = %1011010 ; TIMER6 = CCP1, TIMER4 = CCP3

setting C2TSEL<1:0>: CCP2 Timer Selection bits to %11 "reserved" is not a good practice
CCPTMRS0 = %01000010 ; TIMER6 = CCP1, TIMER4 = CCP3 is preferable

**l_gaminde** · - 26th June 2025, 04:55

Yes the 11 i wasn't sure how to deal with it. So I put it in there if it didn't work. I would have pulled it right out, but it did work in this case. Remember, it's been 15 years since I've done any programming. I wasn't sure how to deal with some of this. So what button do you use to put code in to the forum messages.

**l_gaminde** · - 26th June 2025, 05:00

Nevermind, I found it a pound tag.

**l_gaminde** · - 27th June 2025, 02:29

Where can I get this program

mister e's pic multi-calc

**richard** · - 27th June 2025, 02:44

Originally Posted by richard

https://www.picbasic.co.uk/forum/showthread.php/4994

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